Jegs Valve Cover Gaskets offer you the ultimate seal. Our Hi-Per Blue valve cover gaskets are a unique blend of nitrile and cork granules. They swell up 30% for maximum sealing. They eliminate wicking and provide better torque retention. Our DrySeal+ valve cover gaskets are made from a high temperature silicone and feature a metal core to resist blowouts and torque limiters to prevent overtightening. Our Premium Cork/Rubber valve cover gaskets provide excellent sealing and resists relaxation to prevent leaks. Made In USAJEGS Cross Reference Guide